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Valbrona wrote:Tried 36 sprocket with original 10 speed Record ... poor shifting on biggest sprockets and too much cross chaining.

I much prefer triples.

Yeah the 10 speed rigs I have I use a triple. Or 32 2x max. Ird made a 34 10 speed but sold out a long time ago. If you try 10 speed shimano the spacing is too far off and shifts like crap. 11speed is close enough to match using a shitmano campatible cassette with a campy drivetrain.

NoTe: you have to use the right version of 11 speed campy there are 3 generations of Campy 11 speed and none play nice with a different generation....Frieeky Italian italian engineering at its finest! Lo l

I had to refuse an EPS warranty today, because someone decided it was a good idea to transplant a medium cage onto his EPS RD and run it with a 32 bottom.

He'd read it would be "OK" on a forum ...

It all shifted fine, chain wrap was OK, so big to big worked ... so, you may ask, why don't Campag offer it as an option? Everybody wants it ... easy win, no?

I'll tell you. Campagnolo tested it. It didn't even get as far as the teams ... the R and D riders at the factory found that the chain can over-run on the smallest sprocket shift and jam between the frame and the casette ... it doesn't happen often but even in an impeccably set up system, it happens - which is why Campagnolo recommend not to do it.

It's straight geometry. If you correctly set the H screw so that on small ring to big sprocket the RD doesn't foul the biggest sprocket, you end up with too much free chain between the top jockey wheel and the smallest sprockets ... and the built-in overshift that produces a crisp, fast shift in a correctly set-up system means that with too much free chain, some of the precision is lost and an over-run can be produced. Shifting in the middle of the cassette can also be a bit flakey.

Back to my refused warranty - chain over-run and jam was exactly what happened to the customer in question, except that in his case, in a violent back-pedal in a panic to try and unjam his chain (he wasn't sure why his pedals had suddenly stopped dead), he so thouroughly demolished the rear mech that bits of it ended up in his rear wheel and took that out, along with the hanger and the dropout too ...

So yes, you can try and second-guess the guys that spend a lot of time (and a lot of your money, BTW - what do you think pays for the R and D?) designing stuff that works pretty much faultlessly if you put it together properly ... but on your own head be it, if it all goes horribly wrong.

For the customer's sake, I'm glad he wasn't in a bunch sprint when it happened - because quite apart from any injury to himself, he'd have quite a lot of pretty p*ssed-off riders after his hide as well if he'd jammed his chain solid shifting up at 60 ot 70 kmh in that scenario.